You can change terminal only with this one command to write a new preference for that specific app.
defaults write com.apple.terminal NSQuitAlwaysKeepsWindows -bool false
This is general, so of course, substitute safari or quicktimeplayerX or whatever in the com.apple.terminal portion of the command as needed. This setting switches the default save behavior upon quitting that one app. You'll find many of the other apps that work well with this setting by searching on NSQuitAlwaysKeepsWindows.